New York copper futures opened with modest gains on Friday as supply disruptions continued to support prices but a firmer US dollar against the euro and a seasonally slow demand period kept a lid on any advance, market sources said.
By 10:24 am EDT (1424 GMT), copper for September delivery rose 1.10 cents at $1.5580 a lb at the New York Mercantile Exchange's COMEX division, dealing from $1.5430 to $1.5630.
Spot July copper was up 1.10 cents as well at $1.6290 a lb, moving in a narrow $1.6180-$1.6290 trading band.
On Thursday, the spot contract hit a new contract high at $1.6450.
COMEX estimated copper volume at 9 am was a modest 2,000 lots.